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Re: [Land-speed] Destroking a Crankshaft...

To: drmayf@mayfco.com, "land-speed@autox.team.net" <land-speed@autox.team.net>
Subject: Re: [Land-speed] Destroking a Crankshaft...
From: Skip Higginbotham <saltrat@pahrump.com>
Date: Tue, 22 Feb 2011 06:45:32 -0800
Easier and more economical to sleeve and pin all eight or even just a 
couple of cylinders. As far as the crank is concerned, you might 
offset grind it and chrome it back to -.20.

Skip








At 10:34 AM 2/20/2011, Larry Mayfield wrote:
>I have been toying around with an idea for a new motor for my Sunbeam.
>But it would require a destroked crank to meet the displacement 
>goals. I have been searching around for such cranks and they are 
>pretty rare. Some are apparently used in a Nascar class somewhere 
>which has a displacement limit.  I know about off set grinding to 
>either stroke or destroke abit.  But, even with a brand new crank, I 
>would not be able to get there.  So, my question... I know cranks 
>can be welded up and reground. But how much can that be used?  If I 
>wanted to take a crank down with a stroke difference of say 1/2 
>inch? That seems like a LOT, lol, as it would require a 1/4 inch or 
>more of buildup on the inside of the rod  throw.   Even if I started 
>with a  289 ford crank it would still be a lot.  And is that even 
>doable with a cast crank?  I would expect it to be ok on a forged 
>steel or billet crank, though.
>
>I'd like some responses from folk who have actually had something 
>like this done.  Suggestions of changing motor blocks etc are not 
>what I am looking for.
>
>And I am just fiddling around now. The Sunbeam may never run again 
>as a race car..and that would no doubt please a LOT of people, lol...
>
>mayf
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